To instantly release the secret characters, the arcade machine operator has to enter the Naomi service menu and switch to the game menu. The following codes must be entered under the password option (all tested with the JPN bios):
Description
Effect
J2ACRC4U
All secret charas
1B6GIMWN
B-Batsu
MGNG8U92
D-Hyo
C83LKN59
Hyo
KROYV4EZ
Kurow
5RC52J3M
P-Akira
YDWVNBTU
Vatsu
RG026E1B
W-Daigo
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